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Exam 8: Photosynthesis

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Question 1

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Which of the following statements about the relationship between photosynthesis and cellular respiration is correct?

A) In cellular respiration,the biochemical pathways of photosynthesis run in reverse.
B) In photosynthesis,the biochemical pathways of cellular respiration run in reverse.
C) Cellular respiration occurs only in animals,and photosynthesis occurs only in plants.
D) There is a net consumption of ATP in cellular respiration and a net production of ATP in photosynthesis.
E) Cellular respiration is catabolic and photosynthesis is anabolic.

F) A) and E)
G) C) and E)

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Question 2

Multiple Choice

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In most plants the carbohydrates produced by photosynthesis are transported out of the leaves to the rest of the plant as which of the following molecules?

A) glyceraldehyde 3-phosphate (G3P)
B) glucose
C) sucrose
D) starch

E) A) and B)
F) A) and C)

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C

Question 3

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When plants produce excess carbohydrates,the extra sugar is generally stored in which of the following forms?

Which of the following sequences correctly represents the flow of electrons during photosynthesis?

Figure 8.2 -Use Figure 8.2 and the compounds labeled A,B,C,D,and E to answer the following question.Which molecule in the Calvin cycle also serves as the substrate for the first step in the energy payoff phase of glycolysis?

What compound provides the reducing power for the Calvin cycle reactions?

In autotrophic bacteria,where are chlorophyll-like pigments located?

A flask containing photosynthetic green algae and a control flask containing water with no algae are both placed under a bank of lights,which are set to cycle between 12 hours of light and 12 hours of dark.The dissolved oxygen concentrations in both flasks are monitored.Predict what the relative dissolved oxygen concentrations will be in the flask with algae compared to the control flask.

The NADPH required for the Calvin cycle is produced by which of the following metabolic reactions?

Which of the following reactions produces the oxygen released by photosynthesis?

Theodor W.Engelmann illuminated a filament of algae with light that passed through a prism,thus exposing different segments of algae to different wavelengths of light.He added aerobic bacteria and then noted in which areas the bacteria congregated.He found that the largest groups were found in the areas illuminated by the red and blue light.What would you predict would happen if you ran the same experiment without passing light through a prism?

Figure 8.2 -Use Figure 8.2 and the compounds labeled A,B,C,D,and E to answer the following question.If ATP used by this plant is labeled with radioactive phosphorus,which molecule or molecules of the Calvin cycle will be radioactively labeled first?

If plants are grown with H₂O containing a radioactive isotope of oxygen (¹⁸O) ,subsequent analysis will show that ¹⁸O first appears in which of the following molecules produced by the plants?

How would you predict that doubling the atmospheric CO₂ concentration would affect C₃ plants?

An early step in the process of carbon fixation combines three molecules of CO₂ with three molecules of RuBP to produce three 6-carbon molecules,which are immediately converted to six 3-carbon molecules.These six molecules are phosphorylated and reduced to produce glyceraldehyde 3-phosphate (G3P) .What additional events occur to complete the Calvin cycle?

Which of the following does not occur during the Calvin cycle?

Imagine that a researcher has developed a way to isolate thylakoids from chloroplasts and to make the pH of the thylakoid space acidic.If these isolated thylakoids are transferred to a pH8 solution in the dark,what might the researcher expect to observe?

What is the relationship between wavelength of light and the quantity of energy per photon?

Generation of proton gradients across membranes occurs during which of the following reactions?

Some photosynthetic organisms contain chloroplasts that lack photosystem II,yet they are able to survive.Which of the following experimental approaches would be a reasonable way to detect the lack of photosystem II in these organisms?